Hoist



E. S. GOODSPEED HoIsT Dec. s,V 1931.

Filed Aug. 17, 1929 2 Sheets-Sheet l lll l atto/mug 5 Dec. 8, 1931. E.s. GooDsPx-:ED

HoIsT Filed Aug. 17, 1929 2 Sheets-Sheet 2 Patented Dec. 8, 1931 UNITEDSTATES PixrsurA OFFICE ELVIN S. GOODSPEED', 0F DETROIT, MICHIGAN,ASSIGNOR TO GENERAL MOTRS OOR- PORATION, OF DETRGIT, MIGHIGAN, ACORPORATION OF DELAWARE HOIST Application le'd August 17, 1929. SerialNo. 386,533.,

This invention relates .to hoists and has .particular reference to ahoist of the overhead type adapted for lifting relatively light loads orloads which are slightly heavier than those which can be convenientlylifted by hand.

The hoist ofthe invention is'intended for use in and about factories andis designedto be suspended over head, preferably by means of a cable orchain so that it is readily 'swing ie able toany'convenient angle.

4 The `hoist of lthe invention comprises a main housing on which anelectric motor is mounted. The motor drives a shaft to which a worm issecured7 the'worm in turnl driving a `worm wheel keyed to a hollowshaft, the end of Vwhich projects beyond the housing and has one halfofa clutch secured thereto.

Concentric with the hollow shaft is a second is adapted to voperate agear loosely mounted on the innershaft adjacent the rack operating gear.VThe freely mounted gear is internally threaded and is adapted tomeshwith a threaded head mounted in a slot in and proj ecting beyondboth sides of the shaft. The head has a rod secured thereto extendingthrough the hollow shaft and is adapted tov operate the clutch at itsother vend. By re.

mounted gear is rotatable which shifts the threaded head back and forthto connect or disconnect the clutch. The control rack is 40. operated bymeansof aspring pressed handle mounted on the lifting rack. v Thelifting rack is providedwith a pair o projecting fingers positioned inparallel vertical planes which are adapted to make and 45:v break theelectric circuit of the motor the rack reaches one extremity of itsmovement.

On the drawings: Y Figure 1 shows a plan view of the hoist. Figure- 2 isa section on the line 2 2 of Figure 1. i v

'ciprocating the control rack, the freely` Referring to the drawings,the numeral 2V indicates the hoist as a whole. The hoist includes themain housing portion 4 having the eye 6 rigidly secured thereto at itsuppermost portion. Y The purpose of the .eye 6 is to allow theattachment of a cable or chain to suspend the hoist overhead. The hoistmay also be rigidly mounted, if desired, but the swingable mounting ispreferred.

A bracket 8 is rigidly mounted atjone side of the housing 4 by means ofthe machine bolts 10 and on the bracket 8 the electric motor 11 isrigidly secured by means of the bolts and nuts 12. The electric'w'iresor con :nectionsfor the motor are not shown as their surrounds the shaft18 and is secured to the` housing 4 by means of the bolts 2G which alsopass through an annular flange lon left hand cup-*shaped bearing portion25. The purpose of the plate 24 is to position the bearing 22 and toexclude dust from the interior of the'housing and the bearing.

The worm meshes with a worm wheel 28 secured by means of a key to ashort hollow shaft 32. The shaft 32 extends through a bearing portion 34in a cover plate 36 secured to the housing by means of the machine bolts38. At its outer end the shaft 32 has secured thereto by means of thekeys 40, a dome 42'which houses and has secured thereto one half 44 of aclutch indicated as whole at 46. The clutch is conventional and. per seforms no part of the inventionand any suitable type of clutch may be'used.

A second or longer hollow shaft 48 is rotatably received withinthehollow shaft 32 and projects into' the dome 42 and beyond bothY sides ofthe housing" 4. At the clutch or dome end of the shaft 48 the secondhalf 50 of the clutch 46 is rigidly mounted by means of the keys 52. Adisk or' spider 54 is freely mounted on the shaft 48 inside the dome 42and is secured to the shaft 48 by means of the slidable T-shaped key 56received in a slot 58 in the shaft. The key 56 as well as the disk orspider 54 are slidably but not turnably mounted relative to the shaft48.

The opposite end of the shaft 48 is mounted in a bearing stud portion 59in the housing 4 and extends through a bearing portion 60 rigidlysecured to the housing 4 by means of the machine bolts 62. The bearingportion 60 is hollow as indicated at`64 and in the hollow portion, thereare received the gears 66 and 68. The O'ear 66 is rigidly mounted on theshaft 48 by means of the key 70 while the gear 68 is internally threaded`as indicated at 72 and is freely or loosely mounted on the shaft 48.rlhe shaft 48rhas a slot 74 beneath the gear 68 and in the slot there isreceived the head 76 having the threads 78 which enga-ge withtheinternal threads 72on the gear 68. A rod 80 is rigidly secured at oneend to the head 7 6 in any suitableway such as by means of a non-vcircular lit orthe riveted over-reduced porw tion 82, and at itsopposite end in a similar manner to the key` 56. The rotation of thegear 68 which is itself held longitudinally immovable relative to theshaft 48) will cause the head 76 to move backward or forward in the slot74 andmove therewith the rod 80. The rod 80 willvv operate the key 56 tocause the disc or spider 54 to connect or dis.- connect thehalves 44 and50 of the clutch 46 to cause the rotation or non-rotation 'of the Thebearing portion 60 has a laterally extending llange or portion 84 havingsuitable openings for the reception of bolts 86.Y @ver the bolts 86there are positioned the rollers 88. Between.` the `rollers V88 and a.cut-out portion 90 in the bearing portion 60, there are mounted the liftrack or bar 92 and the control rack orbar 94 meshing respectively withthev gears 66 and 68. 'The rotation of the shaft 48 and its gear 66 willtherefore cause a movement of the lift rack' 92 to raise or lower theload. As is best 'seen in Figure 1, the lift rack 92 has'a rabbet 98formed at one corner in which the control rack 94 is mountbolts 96. Thepurpose of the control rack 94 Ais to rotate the loosely mounted vgear68 'to cause the Yengagement or disengagement of the clutch 46.

The lift rack 92 extends downwardly fron'i the hoist and has mounted atits end a. loop or ring 98 adapted to be attached to the load. The loop98 is swivelly mounted between a pair of collars 100 secured to the rackin any trol rack 94 and gear 68 may be moved to shift the rod to operatethe clutch.

Inasmuch as the control rack 94 is mounted on the rack 92, the two willordinarily move in unison. There is only relative movement between thetwo racks when the operator positively raises or lowersthe handle 106.Under normal operating conditions therefore the gears 66 and 68 turntogether and with the shaft 48.

Adjacent its lower end the lift rack 92 is provided with a pair offingers 112 and 114 which are spaced apart in vertical planes or securedto opposite sides of the rack. The function of the linger 114 is tostrike the arm 116 of the switch when the rack reaches its uppermostposition while the purpose of the finger 112 is to strike the arm 118 ofthe switch to throw on the motor when the'rack 92 is pulled downward.The linger 114 therefore serves as a means for automatically throwingolf the power from the motor 11 when the rack has reached its uppermostposition. rlhe lowering movement of the rack 92 is limited by theengagement of the gear 66 with the non-threaded end 119 of the rack.

`The operation'of the hoist is as follows: Assuming' that the parts arein the position shown in Figure 2 (which is the uppermost position ofthe rack bar 92) the operator grasps the handle 106 and pulls itdownward. r1his will rotate the gear 68 and cause the head 76 to move tothe left (Figure 2) to disengage the clutch. At the same time thedownward pull or movement of the handle will pull the rack 92 therewithand cause the finger 112 to strike the arm 118 to throw on the switch tostart the motor. but-as the clutch is released the motor will notoperate the shaft 48. The handle 106 is held downward until the load isapplied to the loop 98. The handle 106 is then released allowing thespring 108 to push the handle 106 and rack 94 upwardly, which willrotate the gear 68 and cause the head 7 6 to move to the right causingthe disc 54 to push the clutch 46 into engagement. The motor 11 will nowrotate the shaft 48 and its gear 66 which will raise the lifting rack 92and cause the elevation of the load. The raising of the load willcontinue either until the operator pulls downward on the handle 106 oruntil the linger 114 strikes the arm 116 of the switch. As the lingerstrikes the arm M6, 'the motor will be thrown off and-due to @theirreversible connection between the wormiZ'O and theworm wheel 28, theload will maintained suspended in the air. If it is .new desired terelease the load, the operator will pall down 'on the handle 1206 tooperate Ethe 'control rack 94, which rotates the gear 68, moving the rodit() tothe left `to disengage the clutch. rThe `load isn'ow free to'descend owing to the fact that the released clutch .456 is between theWorm fand the rack. The iinger 112 on the rack will again throw theswitch to `'start the motor and if .it is desired to stop the load :at'any'interme'diate point, the operator may rel-ease the handle 106 whichwill again throw in the lclutch to canse the .motor to raise the load.The yoperator may therefore deposit the load fait any desired point `andafter the l-'oad is deposited A, and the handle 106 released, the hoistwill again move in the positionshown in Figure 2. In case it is not`desired to raise the load to the limits ofthe hoist, fthe clutch may bediseng-aged at `any intermediate point loy pushing the handle 106upwardly. The load will then descend to :the benchfor block 'as desired.

The hoist of the invention is relatively light and is particularlyadaptable to the raising of the light loads or such loads as are notordinarily within the handling abilit-y of the workmen, such as loads of200 or 300 pounds.

I claim:

1. In a swingably suspended hoist, a shaft operated from a source ofpower, a bar vertically reciprocably operated from said shaft, means onsaid bar for attaching a load, a clutch for connecting the power to ordisconnecting it from the shaft to control the movement of the bar, andmeans to operate the clutch.

2. In an-overhead swingably suspended hoist, a shaft operated from asource of power, a bar operated from said shaft and adapted to lift aload, and means including a reciprocable member on said bar forconnecting and disconnecting said shaft with the source of power tocontrol movements of said bar.

3. In a hoist, a shaft operated from a source of power, a gear on saidshaft, a rack meshing with and operated from said gear, means on saidrack to attach a load, a clutch connecting the source of power and theshaft, and means concentric with the shaft for operating said clutch toconnect or disconnect said source of power and shaft.

fi. In a hoist, a shaft operated from a source of power, a bar operatedfrom said Vshaft and adapted to raise a load, a clutch between saidsource of power and said shaft, and means concentric with said shaft andoperable from said bar for operating said clutch to connect ordisconnect said source of power and shaft.

5. In ahois't, la shaft operated from a source ofpower, load elevatingmeans operated from said shaft, a clutch between said source of power'and said shaft, and means operated from said load elevating means forconnecting or 'disconnecting said clutch to control said .loa-dv'elevating means.

6. ln a hoist, a shaft operatedfrom a source of power, load elevatingVmeans operated from said shaft, a clutch between said source of powerand said shaft, "and means concentric with said vshaft andopera'ble fromsaid load elevating means for connecting and disconnecting said clutch.

7. :In a lifoist, a shaft operated from a source 'of ip'ower, loadelevating means ope-r ated from said shaft, a clutch between said sourceof power fand said shaft, a gear freely mounted on said shaft, meansprojecting n said shaft and moved by said gear, ns operated from saidproj ecting means to 4Conn-ect or disconnect said clutch, and means foroperating said gear.

8. In a hoist, a shaft operated from a source of power, load elevatingmeans operA ated from said shaft, a clutch between said source of powerand said shaft, a rotatable member .free-ly mounted on said shaft, meansprojecting from said shaft and operated by said member to loperate saidclutch, and

means for rotatingsaid member.

'9. In a hoist, a shaft driven from a source of power, load eleva-tingmeans operated from said shaft, a 'clutch between said source of powerand said shaft, a rotatable member freely mountedon said shaft, a memberprojecting from said shaft and having `threaded engagement with theinterior yof said rotatable member, a rod `connected to said project-ingmember and adapted to operate said clutch, and means for rotating saidrotatable member.

10. In a hoist, a shaft driven from a source of power, load elevatingmeans operated from shaft, a gea-r internally and externally threadedand loosely mounted on said shaft, a threaded head mounted in a slot inand projecting from said shaft and engaging the internal threads on saidgear, acluteh for connecting and disconnecting said shaft with thesource of power, a rod secured to said head and extending centrally ofsaid shaft and 'adapted to operate said clutch, and means on said loadelevating means for rotating said gear. v Y

11.. In a hoist, a shaft vdriven from a source of power, load elevatingmeans operated 'from said shaft, 'a gear internally and externallythreaded and loosely mounted on said shaft, a threaded head mounted in aslot in and projecting from said shaft and engaging the internal threadson said gear, a clutch for connecting and disconnecting said shaft withthe source rof power, a rod secured to said head and extending`centrally of said shaft and adapted to operate said clutch, and a rackpreciprocably mounted on said load elevating means for rotating saidgear.

12. In a hoist, a shaft driven from a source of power, load elevatingmeans operated from said shaft, an element parallel with and secured tosaid elevating means, and means manually operable from said element toconnect or disconnect said shaft and source of' power. l

13. In a hoist, a shaft driven from a source of power, a reciprocableload elevating bar operated from said shaft, a clutch between saidsource of power and shaft, means for operating said clutch, a barparallel with said elevating bar and adapted to operate said means, anda handle on said elevating bar to operate said second named bar.

14. In a hoist, a shaft driven from a source of power, a reciprocaloleload elevating har operatedA from said shaft, a clutch between saidsource ofpower and shaft, means for operating said clutch, a barparallel with said elevating bar and adapted to operate said means, ahandle on saidA elevating bar to operate said second named bar, andresilient means operating on said handle and urging said handle and barto move said means to clutch engaged position.

15. In a hoist, a shaft driven from a source of power,a clutch betweensaid shaft and source of power, a gear rigid with said shaft, a gearloosely mounted on said shaft, a load elevating bar meshing with andoperated by said rigidly mounted gear, a control bar reciprocablymounted on said elevating bar and engaging said loosely mounted gear,and means operated on the reciprocation of said control bar to engage 0rdisengage said clutch.

16. Ina hoist, a shaft driven from a source of power, a clutch betweensaid shaft and source of power, a gear rigid with said shaft, a gearloosely mounted on said shaft, a load elevating bar meshing with andoperated by said rigidly mounted gear, a control bar reciprocablymounted on said elevating bar and engaging said loosely mounted gear, ahandle around said elevating bar and attached to said control barforreciprocating said control bar to operate said loosely mounted gear,and means operated by said gear to engage or disengage said clutch.

17. In a hoist, a shaft driven from a source of power, a clutch betweensaid shaft and source of power, a. gear rigid with said shaft, a gearloosely mounted on said shaft, a load elevating bar meshing with andoperated by said rigidly mounted gear, a control bar reciprocablymounted on said elevating bar and engaging said loosely mounted gear,means operated on the reciprocation of said control rod to engage ordisengage said clutch, and means on said elevating bar adapted to throwoli' the source of power when said bar is at one extremity of itsvmovement.

18. In an overhead freely swingable hoist, a housing, a shaft mounted insaid housing and extending beyond both sides thereof and driven from asource of power rigidly mounted relative to said housing, a clutch atone end of said shaft between said source of power and shaft, a gearrigidly mounted on the opposite end of said shaft, a load elevating rackmeshing with and operated from said gear, and means on the gear end ofthe shaft for connecting or disconnecting said clutch.

19. In an overhead freely swingable hoist, a housing, a shaft mounted insaid housing and extending beyond both sides thereof and driven from asource of power rigidly mount ed relative to said housing, a clutch atone end of said shaft between said source of power and shaft, a gearrigidly mounted on the opposite end of said shaft, a load elevating rackmeshing with and operated from said gear, a rod in said shaft connectedto said clutch, means at the gear end of said shaft for operating saidrod, and means for operating said first named means. 1 I

In testimony whereof I aliiX my signature.

ELVIN S. GOODSPEED.

